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Loans (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Fixed interest rates $ 3,322,817us-gaap_LoansReceivableWithFixedRatesOfInterest1 $ 3,252,331us-gaap_LoansReceivableWithFixedRatesOfInterest1
Floating interest rates 3,363,427us-gaap_LoansReceivableWithVariableRatesOfInterest1 2,895,967us-gaap_LoansReceivableWithVariableRatesOfInterest1
Loans and Leases Receivable $ 6,686,244us-gaap_LoansAndLeasesReceivableGrossCarryingAmount [1] $ 6,148,298us-gaap_LoansAndLeasesReceivableGrossCarryingAmount [1]
[1] Current ratings as of December 31, 2014 and 2013, respectively.